公开(公告)号：US20200245069A1

公开(公告)日：2020-07-30

申请号：US16842531

申请日：2020-04-07

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Robert David RAND ,  John Laurence PENNOCK

IPC: H04R5/04 ,  H01R13/66 ,  H01R29/00 ,  G06F13/38

Abstract: Embodiments of the present disclosure relate to methods and apparatus for peripheral device discovery, the detection of orientation of a connector having multiple degrees of rotational symmetry, and the provision of appropriate signal paths between a host device and a peripheral device. Some embodiments provide a characteristic impedance within the peripheral device that is coupled between rotationally symmetric contacts of the connector and thus enables detection of the connector orientation. The value of the characteristic impedance may be used in some embodiments to determine the type or model of peripheral device. Some embodiments are concerned with the enablement of appropriate signal paths to a peripheral device having a transducer (e.g. a loudspeaker) coupled only to rotationally symmetric contacts of the connector, such as headphones implemented in a “balanced” configuration.

公开(公告)号：US20200068299A1

公开(公告)日：2020-02-27

申请号：US16667224

申请日：2019-10-29

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ross Crawford MORGAN ,  Robert David RAND ,  Richard Colin FITZGERALD

IPC: H04R3/00 ,  H03G3/00 ,  G10L21/034 ,  H03G3/30

Abstract: There is provided an apparatus for providing an output signal to an audio transducer, comprising: a first signal path for receiving a first digital audio input signal, applying a first digital gain, and outputting an amplified first digital audio input signal; a second signal path, for receiving a second digital audio input signal, applying a second digital gain, and outputting an amplified second digital audio input signal; converter circuitry, coupled to the first and second signal paths, for converting at least the amplified first and second digital audio input signals into the analogue domain, and outputting an analogue audio input signal; and an analogue gain element, for applying an analogue gain to the analogue audio input signal and outputting the output signal. The apparatus further comprises a control circuit, coupled to the first and second signal paths, operative to select the analogue gain based on a combination of at least the first and second digital audio input signals or signals derived therefrom, and to select the first and second digital gains so as to compensate for the analogue gain.

公开(公告)号：US20180173661A1

公开(公告)日：2018-06-21

申请号：US15847183

申请日：2017-12-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Robert David RAND ,  Nigel BURGESS

IPC: G06F13/38 ,  G10L19/00 ,  H04R3/00 ,  G06F13/42 ,  G06F13/40

Abstract: This application relates to transfer of digital audio data between a host device (200) and an accessory apparatus (101) that may be connected to the host device via a suitable connector (106), such as a USB connector. A path selector (240, 270) is operable to establish either a first digital data path (201) or a second digital data path (202) for transfer of digital data. The first digital data path (201) includes a first data bus host (103) and a general purpose digital data interface (131) suitable for bulk data transfer between the first data bus host and the applications processor (110) of the device. This may be a default USB path. The second digital data path (202) includes a second data bus host (230) and at least one pair of second path data interfaces (140, 141). The second data bus host (230) does not form part of the applications processor and each of said second path data interfaces comprises a digital audio interface suitable for streaming of audio data. The path selector selectively establishes the first data path for bulk digital data transfer or the second data path for streaming of audio data where latency is important.

公开(公告)号：US20180039769A1

公开(公告)日：2018-02-08

申请号：US15667849

申请日：2017-08-03

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Sunil SAUNDERS ,  Robert David RAND ,  Robert James HATFIELD ,  John Laurence PENNOCK

IPC: G06F21/32 ,  G06K9/62 ,  G06F1/32 ,  G06K9/00 ,  G10L17/22

Abstract: An electronic device, comprising one or more input devices, for receiving biometric input from a user and generating one or more biometric input signals; an applications processor; a mixer configurable by the applications processor to provide a first signal path between one or more of the input devices and the applications processor; and a biometric authentication module coupled to the one or more input devices via a second signal path that does not include the mixer, for performing authentication of at least one of the one or more biometric input signals.